partying

Much to Mischa Barton's neighbors' excitement, she moved out of her Lower East Side apartment in New York City last year. She apparently made a lot of noise (shocker!) partying or "moving furniture."

But one thing she forgot to do before she left? There was a funny thing, called rent, that she didn't manage to pay for three months. Now she's being sued by her management company for the $21,000 she owes them.

According to reports, tennis beauty Anna Kournikova got into a cat fight at a Las Vegas nightclub – after a woman hurled a drink at her.

The Russian-born tennis ace – who is dating singer Enrique Iglesias – was partying with pals at Sin City hotspot Lavo.

But a fellow clubgoer got upset and sparked a brawl. "[The woman] threw a drink at Anna. She felt Anna was invading her space," an unnamed source mentioned.

We love that Zac Efron has such a great head on his shoulders.

And not only because it’s pretty.

While promoting 17 Again last week, Zac was asked why he’s not much of a Lohan-esque party boy seen wasted, stumbling out of clubs and scowling at the paparazzi.

“There’s a time for celebration and I partake, sure,” he said. “But, you know, it’s important not to let that become too big of a distraction. The more you have access to, the harder it is to remain focused."